Last week, we told you about the amazing spirit of derrick Coleman, the football star heading to the super bowl. He is deaf. And impossibly, he does it all by Reading lips. Now, ABC's Neal Karlinsky tells us about two 9-year-old girls who agree he's great. At the game, and at life. Reporter: Seattle seahawks' derrick Coleman never imagined what would happen when his life as an NFL player played out in this duracell battery commercial last week. They told me it couldn't be done. That I was a lost cause. I was picked on. Reporter: Today Coleman is a power house. The quarterback turns so Coleman can see him talk. He mouthed the audible to him. 9-year-old Riley and his twin sister, Erin, are both hearing impaired. And they were transfixed. Finally, there was someone who understood their problem. So, Riley wrote him a letter. I know how you feel. I also have hearing AIDS. Just try your best. I have faith in you, derrick. Their dad tweeted the letter out. And wouldn't you know it, today, Coleman, who is just 23 years old and headed for the super bowl, wrote them back. I want you to know that I always try my best in everything I do and have faith in you and your sister, too. Even though we wear hearing AIDS, we can still establish our goals and dreams. He's a big star football player. If he was -- I can't believe he got this far. It's just not that easy. When you see somebody that's been through the struggles the same as you are, and I tell them, I did it. Reporter: Come super bowl Sunday, derrick Coleman will be there, hearing AIDS on. Just like kids everywhere, and proud. Neal Karlinsky, ABC news, Seattle.

This transcript has been automatically generated and may not be 100% accurate.